If the mesh has a line even without textures, it's probably because the topology is splitten. Make sure all vertices are merges together and not overlapping.
If everything is as it should be, but the issue persists you can still send me the .SPP file at cdellenbach@adobe.com with a link to this thread, so I can take a closer look.
Best regards,
Cyril Dellenbach (Micro) | QA Support Artist | Adobe
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